Questions tagged [charger]

A device which controls the voltage and current being delivered to a capacitor or battery.

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Bike mobile charger

Hi, I've made a battery operated mobile charger using this circuit. I am able to charge the basic phones (with 2100mAh battery) with it. But the problem is, I couldn't charge any smart phones (with ...
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176 views

Full Charge Indicator

Can someone explain or give an outline of how the indicators on chargers work? I have a charger for a device, which displays a red light when connected and not fully charged, but after it is charged ...
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2answers
52 views

Battery Discharged - But Potential difference exists without any current flow

My below question is regarding batteries. I have a USB charger and a mobile battery (Li-ion battery). So, my mobile battery percentage has dropped to 0%. So, what I do now - Take the USB Charger. Plug ...
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88 views

What would be the safest method to power a laptop (IdeaPad 510 15isk) from a 14.8v battery pack?

Looking at my existing power jack and measuring it crudely with a cm ruler it looks like 3mm diameter x 1 cm length. The laptop bottom and charging adapter both say 20v @ 3.25 A max. What would be ...
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1answer
3k views

LiIon tp4056 with protection, avoid drop out voltage at output

I have checked some behaviour in TP4056 boards (with protection circuit) that i don't like at all. (see schemas at the end) When you use the TP4056 module with the protección board, you will get a ...
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144 views

Voltage regulator question

I have made a portable device charger with a 5 volt voltage regulator(7805-TO220 package),a 9 volt battery and a few capacitors.The problem is,when I connect the charger to a certain device(whose ...
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1answer
131 views

Backup battery charger

I'm trying to design some kind of backup battery charger - please see the image: Normally, the DC supply is ON, and provides current for load and also charges the battery. Battery should be charged ...
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2answers
4k views

Plug in charger in laptop before plugging in mains outlet [duplicate]

Feel free to delete the question if doesn't fit here. Somebody told me, that a person should plug the charger in the laptop side first, then in the mains outlet, as if there is a current peak, it is ...
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1answer
61 views

How to tell a battery's ideal charging voltage with a circuit?

simulate this circuit – Schematic created using CircuitLab I've been looking to build a universal charger for my laptop and phone, and I'm wondering; is there a viable way to adjust the input ...

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